A method for preparing composite uranium extraction materials, the composite uranium extraction materials and their applications

Abstract

This application discloses a method for preparing a composite uranium extraction material, the composite uranium extraction material itself, and its applications. The method for preparing the composite uranium extraction material is characterized by the following steps: adding chitosan, tert-butyl hydrogen peroxide, and ultrapure water to a reactor vessel, setting a preset stirring temperature, and stirring for several minutes under an inert atmosphere; adding an aqueous solution of 2-methacryloyloxyethyl phosphorylcholine to the reactor vessel, setting a preset oil bath temperature, and performing a polymerization reaction for several hours under an inert atmosphere to obtain a crosslinked product; washing the crosslinked product and then vacuum drying it at a preset cooling temperature to obtain a chitosan-phosphorylcholine copolymer, thus obtaining the composite uranium extraction material. This method for preparing the graphene oxide composite uranium extraction material is simple, efficient, and easy to scale up for production. As a novel uranium ion adsorption material, it has good market prospects in seawater uranium extraction and uranium-containing wastewater treatment.

Description

Technical Field

[0001] This application belongs to the field of seawater uranium extraction and uranium-containing wastewater treatment technology, specifically relating to a method for preparing a composite uranium extraction material, the composite uranium extraction material and its application. Background Technology

[0002] Developing materials with highly efficient uranium adsorption capacity is of great significance for the comprehensive utilization of uranium resources. However, currently reported uranium adsorption materials suffer from shortcomings such as low adsorption capacity and poor adsorption selectivity, which limits their practical applications. Therefore, developing novel uranium adsorption materials to improve their adsorption capacity and selectivity is particularly important. Previous studies have reported that uranium extraction materials using phosphocholine-based ligands exhibit excellent selectivity for uranium adsorption; however, their adsorption capacity is not high enough to meet the requirements for uranium adsorption in seawater extraction and uranium-containing wastewater. To achieve more efficient uranium adsorption and extraction, developing novel uranium adsorption materials with high adsorption capacity based on highly selective phosphocholine ligands is of great significance. Summary of the Invention

[0003] In view of this, the present application provides a composite uranium extraction material, a preparation method thereof, and its application, aiming to solve the problem of weak uranium adsorption capacity of existing uranium extraction materials.

[0004] The specific technical solutions adopted in the embodiments of this application are as follows:

[0005] In a first aspect, embodiments of this application provide a method for preparing a composite uranium extraction material, the method comprising the following steps:

[0006] Chitosan, tert-butyl hydrogen peroxide and ultrapure water were added to a reactor vessel, the preset stirring temperature was set, and the mixture was stirred for several minutes under an inert atmosphere.

[0007] Add an aqueous solution of 2-methacryloyloxyethylphosphorylcholine to the reactor vessel, set a preset oil bath temperature, and polymerize the product in an inert atmosphere for several hours to obtain a crosslinked product.

[0008] After washing, the crosslinked product is placed at a preset cooling temperature and vacuum dried to obtain a product of chitosan and phosphocholine copolymer, which is the composite uranium extraction material.

[0009] In some embodiments, the mass percentage of chitosan and tert-butyl hydrogen peroxide is 93%:7%; the amount of ultrapure water used is 50 to 100 times the total mass of chitosan and tert-butyl hydrogen peroxide; the preset stirring temperature is 60 to 98°C; and the stirring time is 30 to 90 minutes.

[0010] In some embodiments, the mass percentages of chitosan and 2-methacryloyloxyethylphosphonic choline are as follows:

[0011] Chitosan 6.25%–25%;

[0012] 2-Methacryloxyethylphosphorylcholine 75%–93.75%.

[0013] In some embodiments, the preset oil bath temperature is 60–98°C; the stirring time is 600–1800 minutes.

[0014] In some embodiments, the preset cooling temperature is 25°C to 40°C.

[0015] Secondly, embodiments of this application provide a composite uranium extraction material, prepared according to the aforementioned preparation method, wherein the structural formula of the composite uranium extraction material is:

[0016]

[0017] Thirdly, embodiments of this application provide a method for preparing a composite uranium extraction material, the method comprising the following steps:

[0018] Chitosan, tert-butyl hydrogen peroxide and ultrapure water were added to a reactor vessel, the preset stirring temperature was set, and the mixture was stirred for several minutes under an inert atmosphere.

[0019] Add an aqueous solution of 2-methacryloyloxyethylphosphorylcholine to the reactor vessel, set a preset oil bath temperature, and polymerize the product in an inert atmosphere for several hours to obtain a crosslinked product.

[0020] After washing, the crosslinked product is placed in a preset cooling temperature and vacuum dried to obtain the product chitosan-phosphocholine copolymer;

[0021] Graphene oxide and the product chitosan-phosphocholine copolymer were respectively dispersed in acetic acid of a set volume fraction to prepare CS-MPC solution and graphene oxide solution.

[0022] The CS-MPC solution and the graphene oxide solution were mixed uniformly and stirred for several hours to obtain a mixed solution.

[0023] The mixed solution was frozen with liquid nitrogen and freeze-dried to obtain a graphene-chitosan-phosphocholine composite material, which is the uranium extraction material.

[0024] In some embodiments, the mass percentage of chitosan and tert-butyl hydrogen peroxide is 93%:7%; the amount of ultrapure water used is 50 to 100 times the total mass of chitosan and tert-butyl hydrogen peroxide; the preset stirring temperature is 60 to 98°C; and the stirring time is 30 to 90 minutes.

[0025] In some embodiments, the mass percentages of the chitosan-phosphocholine copolymer and the graphene oxide are as follows:

[0026] Chitosan-choline copolymer 50%–90.9%;

[0027] Graphene oxide accounts for 9.1% to 50.0%.

[0028] In some embodiments, the preset oil bath temperature is 25°C to 60°C; the stirring time is 10 to 90 minutes.

[0029] In some embodiments, the preset cooling temperature is -60 to -198°C.

[0030] Fourthly, embodiments of this application provide a composite uranium extraction material, which is a graphene-chitosan-phosphocholine composite material prepared by the aforementioned preparation method.

[0031] In some embodiments, the graphene-chitosan-phosphocholine composite material exhibits a uranium adsorption capacity of 350–1690 mg U / g under visible light irradiation and a uranium adsorption capacity of 260–820 mg U / g under no-light conditions.

[0032] Fifthly, embodiments of this application provide an application of the aforementioned adsorption material in uranium extraction from seawater or uranium adsorption in uranium-containing wastewater. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the morphology of a graphene-chitosan-phosphocholine composite material prepared according to an embodiment of this application. Detailed Implementation

[0034] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0035] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0036] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if detected [the described condition or event]" may be interpreted, depending on the context, as meaning "once determined," "in response to determination," "once detected [the described condition or event]," or "in response to detection [the described condition or event]."

[0037] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0038] To illustrate the technical solution of this application, the following embodiments will be used for explanation.

[0039] In a first aspect, embodiments of this application provide a method for preparing composite uranium extraction materials, the method comprising the following steps:

[0040] Chitosan, tert-butyl hydrogen peroxide and ultrapure water were added to a reactor vessel, the preset stirring temperature was set, and the mixture was stirred for several minutes under an inert atmosphere.

[0041] An aqueous solution of 2-methacryloyloxyethylphosphorylcholine was added to the reactor vessel of this embodiment. The preset oil bath temperature was set, and the crosslinked product was obtained by polymerization reaction in an inert atmosphere for several hours.

[0042] After washing, the crosslinking product of this embodiment is placed at a preset cooling temperature and vacuum dried to obtain chitosan-phosphocholine copolymer (CS-MPC), which is the composite uranium extraction material of this embodiment.

[0043] In this embodiment, choline and chitosan are used as raw materials for uranium extraction, achieving highly selective adsorption of uranium. Because choline is used, this uranium extraction material exhibits highly selective adsorption of uranium, demonstrating excellent selective adsorption of uranium in systems containing multiple metal ions.

[0044] In some embodiments, the mass percentage of chitosan and tert-butyl hydrogen peroxide in this embodiment is 93%:7%, and the amount of ultrapure water used is 50 to 100 times the total mass of chitosan and tert-butyl hydrogen peroxide; the preset stirring temperature in this embodiment is 60 to 98°C; and the stirring time in this embodiment is 30 to 90 minutes.

[0045] By setting the reaction conditions specified in this embodiment, the decomposition of tert-butyl hydroperoxide, which would otherwise affect the uranium enrichment material preparation effect, is avoided when the preset temperature is exceeded or excessive stirring is performed.

[0046] In some embodiments, the mass percentage components of chitosan and 2-methacryloyloxyethylphosphonic choline in this example are as follows:

[0047] Chitosan 6.25%–25%;

[0048] 2-Methacryloxyethylphosphorylcholine 75%–93.75%.

[0049] In the preparation method of this embodiment, the uranium adsorption capacity of the uranium extraction material is improved by reasonably controlling the amount of choline added, while ensuring that the uranium extraction material has good structural stability. This achieves the effect of high stability and high uranium adsorption capacity of the uranium extraction material at the same time, avoiding the destruction of the structural stability of the uranium extraction material due to excessive use of choline.

[0050] In some embodiments, the preset oil bath temperature is 60–98°C; the stirring time is 600–1800 minutes.

[0051] In the preparation method of this embodiment, by setting the preset oil bath temperature and stirring time to specified values, it is avoided that the reaction may be incomplete or not occur due to too low a temperature or too little stirring time, and that too high a temperature or too long a reaction time may lead to an increase in by-products.

[0052] In some embodiments, the preset cooling temperature is 25°C to 60°C.

[0053] Secondly, embodiments of this application provide a composite uranium extraction material, prepared according to the aforementioned preparation method. This composite uranium extraction material is a chitosan-phosphocholine copolymer (CS-MPC), and its structural formula is:

[0054]

[0055] The product obtained in this embodiment is a chitosan-phosphocholine copolymer. This composite uranium extraction material has the characteristics of cross-polymerization. In this embodiment, due to the use of chitosan and phosphocholine copolymerization, the two polymer molecules endow the uranium extraction material with good hydrophilicity and selective coordination with uranium, realizing the high selective adsorption of uranium by the uranium extraction material in an aqueous environment.

[0056] Thirdly, embodiments of this application provide a method for preparing composite uranium extraction materials, the method comprising the following steps:

[0057] Chitosan, tert-butyl hydrogen peroxide and ultrapure water were added to a reactor vessel, the preset stirring temperature was set, and the mixture was stirred for several minutes under an inert atmosphere.

[0058] An aqueous solution of 2-methacryloyloxyethylphosphorylcholine was added to the reactor vessel of this embodiment. The preset oil bath temperature was set, and the crosslinked product was obtained by polymerization reaction in an inert atmosphere for several hours.

[0059] After washing, the crosslinking product of this embodiment is placed at a preset cooling temperature and vacuum dried to obtain the product chitosan-phosphocholine copolymer, which is the composite uranium extraction material of this embodiment.

[0060] Graphene oxide and the product chitosan-phosphocholine copolymer were respectively dispersed in acetic acid of a set volume fraction to prepare CS-MPC solution and graphene oxide solution.

[0061] The CS-MPC solution and the graphene oxide solution were mixed uniformly and stirred for several hours to obtain a mixed solution.

[0062] The mixed solution was frozen with liquid nitrogen and freeze-dried to obtain a graphene-chitosan-phosphocholine composite material (GCM), which is the uranium extraction material.

[0063] The raw material components of the graphene oxide composite uranium extraction material prepared in this embodiment are graphene oxide, chitosan, and 2-methacryloyloxyethyl phosphorylcholine. The preparation method first uses tert-butyl hydroperoxide-initiated surface graft polymerization to polymerize different masses of 2-methacryloyloxyethyl phosphorylcholine and chitosan to obtain polymer CS-MPC. Then, CS-MPC and graphene oxide are uniformly mixed, and the mixed solution is directionally frozen with liquid nitrogen. After freeze-drying, the graphene oxide composite uranium extraction material GCM with photothermal conversion capability of this embodiment is obtained. The layered structure of the graphene oxide composite uranium extraction material of this embodiment can more effectively capture uranium ions, and it also has excellent photothermal conversion performance. Under visible light irradiation, it can effectively change the microenvironment near the adsorbent, significantly improving the adsorption performance of the adsorbent material. This method for preparing the graphene oxide composite uranium extraction material with photothermal conversion capability is simple, efficient, and easy to scale up for production. As a novel uranium ion adsorbent, it has good market prospects in seawater uranium extraction and uranium-containing wastewater treatment.

[0064] In this embodiment, by using choline and chitosan as raw materials for uranium extraction, highly selective adsorption of uranium by the uranium extraction material in an aqueous environment is achieved. Furthermore, the preparation method of this uranium extraction material in this embodiment, due to the addition of graphene oxide, endows the material with photothermal conversion properties. The presence of graphene oxide ensures the photothermal conversion performance of the composite uranium extraction material, while its self-assembled layered structure provides more adsorption sites, thereby significantly increasing the uranium adsorption capacity of the material. The preparation method of the graphene oxide composite uranium extraction material with photothermal conversion capability in this embodiment is simple and highly efficient.

[0065] In some embodiments, the mass percentage of chitosan and tert-butyl hydrogen peroxide in this embodiment is 93%:7%; the amount of ultrapure water used is 50 to 100 times the total mass of chitosan and tert-butyl hydrogen peroxide; the preset stirring temperature in this embodiment is 60 to 98°C; and the stirring time in this embodiment is 30 to 90 minutes.

[0066] By setting the reaction conditions specified in this embodiment, the decomposition of tert-butyl hydroperoxide, which would otherwise affect the uranium enrichment material preparation effect, is avoided when the preset temperature is exceeded or excessive stirring is performed.

[0067] In some embodiments, the mass percentage components of chitosan-choline phosphate copolymer and graphene oxide in this embodiment are as follows:

[0068] Chitosan-choline copolymer 50%–90.9%;

[0069] Graphene oxide accounts for 9.1% to 50.0%.

[0070] In this embodiment, the amount of choline added is reasonably controlled to improve the uranium adsorption capacity of the uranium extraction material while ensuring good structural stability. This achieves both high stability and high uranium adsorption capacity, avoiding the structural instability caused by excessive choline. Furthermore, this embodiment also controls the amount of graphene oxide added to prevent excessive graphene oxide from reducing the uranium adsorption capacity of the uranium extraction material.

[0071] In some embodiments, the preset oil bath temperature is 25°C to 60°C; the stirring time is 10 to 90 minutes.

[0072] In the preparation method of this embodiment, by designing the preset oil bath temperature and stirring time to specified values, it is avoided that excessively low or high temperatures or excessively short stirring times may lead to insufficient self-assembly of the uranium-enriching material, thereby affecting the performance of the uranium-enriching material.

[0073] In some embodiments, the preset cooling temperature is -60 to -198°C.

[0074] This embodiment avoids the possibility that excessively high temperatures may prevent the uranium-enriching material from forming a lamellar structure, thereby affecting the performance of the uranium-enriching material.

[0075] Fourthly, this application provides a composite uranium extraction material, specifically a graphene-chitosan-phosphocholine composite material (GCM) prepared according to the aforementioned preparation method. A schematic morphology diagram of the GCM is shown below. Figure 1 As shown.

[0076] The uranium extraction material prepared in this embodiment uses phosphocholine as a coordination unit, chitosan as a self-assembly linking unit, and graphene oxide as a photothermal unit, which gives it a high selective coordination ability for uranium, excellent hydrophilicity and micron-scale sheet structure, as well as photothermal conversion performance. This enables the uranium extraction material to adsorb uranium with high selectivity and high adsorption capacity in an aqueous environment.

[0077] The graphene oxide composite uranium extraction material of this embodiment, which has photothermal conversion capability, has efficient coordination performance and can more effectively capture uranium ions under visible light irradiation. It has the advantages of large adsorption capacity, good photothermal conversion performance and strong resistance to salt ions, and has broad market prospects.

[0078] In some embodiments, the uranium adsorption capacity under visible light irradiation is 350–1690 mg U / g, and the uranium adsorption capacity under no-light conditions is 260–820 mg U / g. The uranium extraction material prepared by this embodiment has good photothermal conversion performance.

[0079] Fifthly, this application provides an application of the aforementioned adsorbent material for uranium extraction in water. Specifically, the uranium extraction materials of all embodiments of this application can be applied to uranium extraction from seawater or wastewater, enabling the extraction of uranium from natural seawater or from uranium-containing wastewater.

[0080] The following describes this embodiment in detail with reference to several specific examples.

[0081] Example 1

[0082] 1. Add 0.2 g chitosan, 15 μL tert-butyl hydrogen peroxide and 10 mL ultrapure water to a round-bottom flask and stir at 80 °C for 30 minutes under a nitrogen atmosphere. Then, dissolve 1 g 2-methacryloyloxyethyl phosphorylcholine in 10 mL of ultrapure water and add 10 mL of the 2-methacryloyloxyethyl phosphorylcholine aqueous solution to the round-bottom flask. Initiate the polymerization reaction in an oil bath at 80 °C under a nitrogen atmosphere for 24 hours to obtain the crosslinked product. Wash repeatedly with ethanol and dry the crosslinked product under vacuum at 50 °C to obtain the product CS-MPC.

[0083] Tests showed that the composite uranium extraction material described above has a uranium adsorption capacity of 479.62 mg / g in a uranium solution with a pH of 6 and a uranium content of 20 mg / L.

[0084] Example 2

[0085] 1. Add 0.2 g chitosan, 15 μL tert-butyl hydrogen peroxide and 10 mL ultrapure water to a round-bottom flask and stir at 80 °C for 30 minutes under a nitrogen atmosphere. Then, dissolve 0.8 g 2-methacryloyloxyethyl phosphorylcholine in 10 mL of ultrapure water and add 10 mL of the 2-methacryloyloxyethyl phosphorylcholine aqueous solution to the round-bottom flask. Initiate the polymerization reaction at 80 °C in an oil bath under a nitrogen atmosphere for 24 hours to obtain the crosslinked product. Wash repeatedly with ethanol and dry the crosslinked product under vacuum at 50 °C to obtain the product CS-MPC.

[0086] Tests showed that the composite uranium extraction material described above has a uranium adsorption capacity of 411.33 mg / g in a uranium solution with a pH of 6 and a uranium content of 20 mg / L.

[0087] Example 3

[0088] 1. Add 0.2 g chitosan, 15 μL tert-butyl hydrogen peroxide and 10 mL ultrapure water to a round-bottom flask and stir at 80 °C for 30 minutes under a nitrogen atmosphere. Then, dissolve 1 g 2-methacryloyloxyethyl phosphorylcholine in 10 mL of ultrapure water and add 10 mL of the 2-methacryloyloxyethyl phosphorylcholine aqueous solution to the round-bottom flask. Initiate the polymerization reaction in an oil bath at 80 °C under a nitrogen atmosphere for 24 hours to obtain the crosslinked product. Wash repeatedly with ethanol and dry the crosslinked product under vacuum at 50 °C to obtain the product CS-MPC.

[0089] 2. Disperse 40 mg CS-MPC and 10 mg graphene oxide (GO) in 2 mL of 2% acetic acid; then mix the CS-MPC and graphene oxide solutions evenly and stir for 24 hours; freeze the mixture in liquid nitrogen in a directional manner and freeze-dry to obtain GCM.

[0090] Tests showed that the graphene oxide composite uranium extraction material with photothermal conversion capability exhibited a uranium adsorption capacity of 767.07 mg / g in a uranium solution with pH 6 and uranium content of 20 mg / L under visible light irradiation, and a uranium adsorption capacity of 595.56 mg / g under no-light conditions.

[0091] Example 4

[0092] 1. Add 0.2 g chitosan, 15 μL tert-butyl hydrogen peroxide and 10 mL ultrapure water to a round-bottom flask and stir at 80 °C for 30 minutes under a nitrogen atmosphere. Then, dissolve 1 g 2-methacryloyloxyethyl phosphorylcholine in 10 mL of ultrapure water and add 10 mL of the 2-methacryloyloxyethyl phosphorylcholine aqueous solution to the round-bottom flask. Initiate the polymerization reaction in an oil bath at 80 °C under a nitrogen atmosphere for 24 hours to obtain the crosslinked product. Wash repeatedly with ethanol and dry the crosslinked product under vacuum at 50 °C to obtain the product CS-MPC.

[0093] 2. Disperse 80 mg CS-MPC and 10 mg graphene oxide (GO) in 2 mL of 2% acetic acid; then mix the CS-MPC and graphene oxide solutions evenly and stir for 24 hours; freeze the mixture in liquid nitrogen in a directional manner and freeze-dry to obtain GCM.

[0094] Tests showed that the graphene oxide composite uranium extraction material with photothermal conversion capability exhibited a uranium adsorption capacity of 832.58 mg / g in a uranium solution with pH 6 and uranium content of 20 mg / L under visible light irradiation, and a uranium adsorption capacity of 685.5 mg / g under no-light conditions.

[0095] The implementation methods of the above embodiments are basically the same, the main difference being the different mass percentages of the raw material components, which lead to different uranium adsorption capacities of the generated product GCM. Specifically, a comparison between Example 1 and Example 2 shows that increasing the amount of phosphocholine can improve the uranium adsorption capacity of the uranium extraction material; a comparison between Example 1 and Example 3 shows that after adding graphene oxide and performing self-assembly to form CS-MPC uranium extraction material, the uranium adsorption capacity of the uranium extraction material increased by 24.2% due to the formation of the sheet structure, and under illumination, the uranium adsorption capacity of the uranium extraction material further increased by 28.8% due to the effect of photothermal conversion; a comparison between Example 3 and Example 4 shows that increasing the amount of CS-MPC can improve the uranium adsorption capacity of the uranium extraction material, and this trend is consistent with the trend that increasing the amount of phosphocholine can improve the uranium adsorption capacity of the uranium extraction material.

[0096] This application is not limited to the specific embodiments described above. Any modifications made by those skilled in the art based on the above concept without creative effort shall fall within the protection scope of this application.

Claims

1. A method for preparing a composite uranium extraction material, characterized in that, The method comprises the following steps: The chitosan, tert-butyl hydroperoxide and ultrapure water are added into a reaction vessel, a preset stirring temperature is set, and stirring is performed for several minutes under an inert atmosphere; A 2-methacryloyloxyethyl phosphorylcholine aqueous solution is added into the reaction vessel, a preset oil bath temperature is set, and oil bath is performed for several hours through polymerization to obtain a crosslinked product; The crosslinked product is washed, vacuum dried at a preset cooling temperature, and a product chitosan-phosphorylcholine copolymer CS-MPC is obtained; The graphene oxide and the product chitosan-phosphorylcholine copolymer are dispersed in acetic acid with a set volume fraction to prepare a CS-MPC solution and a graphene oxide solution; The CS-MPC solution and the graphene oxide solution are uniformly mixed and stirred for several hours to obtain a mixed solution; The mixed solution is frozen with liquid nitrogen, and after freeze-drying, a graphene-chitosan-phosphocholine composite material is obtained, that is, the uranium extraction material; wherein the mass percentage of chitosan and tert-butyl hydroperoxide is: 93%: 7%; the amount of ultrapure water is 50~100 times the total mass of chitosan and tert-butyl hydroperoxide; the preset stirring temperature is 60~98 o C; the stirring time is 30~90 minutes; the mass percentage of chitosan and phosphocholine copolymer and the graphene oxide is as follows: The chitosan-phosphorylcholine copolymer is 50% to 90.9%; The graphene oxide is 9.1% to 50.0%; The preset oil bath temperature is 25 o C ~60 o C; the stirring time is 10-90 minutes.

2. A composite uranium extraction material, wherein the composite uranium extraction material is a graphene-chitosan-phosphorylcholine composite material prepared by the preparation method according to claim 1.

3. The composite uranium extraction material of claim 2, wherein, The graphene-chitosan-phosphorylcholine composite material has a uranium adsorption capacity of 350 to 1690 mg U / g under visible light irradiation and a uranium adsorption capacity of 260 to 820 mg U / g without light irradiation.

4. Use of the composite uranium extraction material prepared by the preparation method according to claim 1 or the composite uranium extraction material according to claim 2 or 3 in uranium adsorption of seawater uranium extraction or uranium-containing wastewater.

Images